C182 PLT MADE APCH TO ISP WHEN HIS DEST WAS HWV. AFTER BECOMING AWARE OF THE MISTAKE HE CHOSE NOT TO ESTABLISH COM WITH ISP TWR.

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VIOLATED 91.130 BY FAILING TO MAINTAIN 2-WAY RADIO COMS WHILE IN LONG ISLAND CLASS C AIRSPACE. WHILE NAVING VISUALLY TOWARD MY DEST (HWV); AND WHILE IN CONTACT WITH NEW YORK APCH AIR TFC ADVISORIES; I MISTOOK ISP FOR HWV AND TURNED TOWARD IT -- AT ABOUT 20 SM OUT. BOTH ARPTS HAVE RWYS 15/33 AND 6/24; SO THEY LOOK ALIKE FROM A DISTANCE. WHEN ABOUT 15 MI OUT; I ADVISED NEW YORK APCH THAT I WAS STARTING MY DSCNT INTO HWV -- I STILL DIDN'T RECOGNIZE THAT I WAS ALIGNED WITH RWY 15 AT ISLIP. WHEN XING THE LONG ISLAND SHORE LINE; NEW YORK APCH GAVE ME A FREQ CHANGE. I CONTACTED THEM; BUT MY RECEPTION WAS SO BAD (UNINTELLIGIBLE RECEPTION) THAT; STILL THINKING I WAS APCHING HWV; I DECIDED TO DISCONTINUE CONTACT WITH NEW YORK APCH. I CHANGED MY XPONDER FROM ASSIGNED CODE TO 1200; AND CONTACTED HWV UNICOM FOR THEIR ACTIVE RWY; WHICH WAS RWY 33. I CONTINUED DSNDING AND LINED UP FOR AN EXTENDED DOWNWIND. BY THE TIME I RECOGNIZED THE ARPT FROM ITS RWY LAYOUT; I WAS ALREADY IN THE ATA. I THEN DECIDED THAT IN ORDER TO MINIMIZE POSSIBLE CONFLICT WITH OTHER ACFT; I WOULD 1) STAY IN A SEE AND AVOID MODE AND NOT DIVERT MY ATTN TO GETTING COM FREQS FROM CHARTS; 2) I WOULD STAY ABOVE GS INTERCEPT ALT; AND 3) I WOULD EXIT THE AIRSPACE AS RAPIDLY AS POSSIBLE. HUMAN PERFORMANCE (MINE) WAS POOR -- OR AT LEAST TOO CASUAL. THIS WAS AN EASY TRIP -- NO WX; GREAT VISIBILITY AND ONLY 45 MINS ENRTE TIME. NAV WAS CASUAL. USED RADIO NAVAIDS FOR THE BEGINNING OF TRIP; BUT LAPSED INTO 'JUST LOOKING OUT THE WINDOW.' DIDN'T MAINTAIN USE OF PREPLANNED VISUAL CHKPOINTS FROM SECTIONAL. PAX DISTR. HAD 2 PAX WHO HADN'T FLOWN WITH ME PREVIOUSLY. SPENT TIME 'POINTING OUT THE SIGHTS.' ALSO; OPTED NOT TO USE MY HEADSET (THEREBY SACRIFICING RECEPTION CLARIFY); IN ORDER TO STAY IN CLOSE TOUCH WITH THE PAX.